Levitt and Dubner do say that the book “overstates”Caldeira’s position. That’s a weasel word: The book claims theopposite of what Caldeira believes. Caldeira told me the bookcontains “many errors” in addition to the “major error” ofmisstating his scientific opinion on carbon dioxide’s role.

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Having downplayed the problem, they try to solve it with aset of silver-bullet technologies known as geoengineering. Onewould shoot millions of tons of sulfur dioxide 18 miles into theair to artificially cool the planet. This could work; it alsocould have dire unintended consequences. Caldeira, who is researching the idea, argues that it cansucceed only if we first reduce emissions. Otherwise, he says,geoengineering can’t begin to cope with the collateral damage,such as acidic oceans killing off shellfish. Levitt and Dubner ignore his view and champion his work asa permanent substitute for emissions cuts. When I told Dubnerthat Caldeira doesn’t believe geoengineering can work withoutcutting emissions, he was baffled. “I don’t understand how thatcould be,” he said.